// Tencent is pleased to support the open source community by making RapidJSON available.
// 
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
//
// Licensed under the MIT License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// http://opensource.org/licenses/MIT
//
// Unless required by applicable law or agreed to in writing, software distributed 
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
// CONDITIONS OF ANY KIND, either express or implied. See the License for the 
// specific language governing permissions and limitations under the License.

#ifndef RAPIDJSON_INTERNAL_STRFUNC_H_
#define RAPIDJSON_INTERNAL_STRFUNC_H_

#include "../stream.h"

RAPIDJSON_NAMESPACE_BEGIN
    namespace internal {

//! Custom strlen() which works on different character types.
/*! \tparam Ch Character type (e.g. char, wchar_t, short)
    \param s Null-terminated input string.
    \return Number of characters in the string. 
    \note This has the same semantics as strlen(), the return value is not number of Unicode codepoints.
*/
        template<typename Ch>
        inline SizeType StrLen(const Ch *s) {
            const Ch *p = s;
            while (*p) ++p;
            return SizeType(p - s);
        }

//! Returns number of code points in a encoded string.
        template<typename Encoding>
        bool CountStringCodePoint(const typename Encoding::Ch *s, SizeType length, SizeType *outCount) {
            GenericStringStream<Encoding> is(s);
            const typename Encoding::Ch *end = s + length;
            SizeType count = 0;
            while (is.src_ < end) {
                unsigned codepoint;
                if (!Encoding::Decode(is, &codepoint))
                    return false;
                count++;
            }
            *outCount = count;
            return true;
        }

    } // namespace internal
RAPIDJSON_NAMESPACE_END

#endif // RAPIDJSON_INTERNAL_STRFUNC_H_
